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Segments Of Business (Tables)
 12 Months Ended
Dec. 31, 2016
Segment Reporting [Abstract]  
Schedule Of Operating Income Derived From Revenues And Expenses By Segment
Year Ended December 31, (in millions)
2016
 
2015
 
2014
Gross Revenues
 
 
 
 
 
Gas Distribution Operations
 
 
 
 
 
Unaffiliated
$
2,818.2

 
$
3,068.7

 
$
3,593.6

Intersegment
12.4

 
0.4

 
0.3

Total
2,830.6

 
3,069.1

 
3,593.9

Electric Operations
 
 
 
 
 
Unaffiliated
1,660.8

 
1,573.6

 
1,672.6

Intersegment
0.8

 
0.8

 
0.8

Total
1,661.6

 
1,574.4

 
1,673.4

Corporate and Other
 
 
 
 
 
Unaffiliated
13.5

 
9.5

 
6.2

Intersegment
413.3

 
396.4

 
412.5

Total
426.8

 
405.9

 
418.7

Eliminations
(426.5
)
 
(397.6
)
 
(413.6
)
Consolidated Gross Revenues
$
4,492.5

 
$
4,651.8

 
$
5,272.4




Year Ended December 31, (in millions)
2016
 
2015
 
2014
Operating Income (Loss)
 
 
 
 
 
Gas Distribution Operations
$
574.0

 
$
555.8

 
$
537.0

Electric Operations
291.4

 
264.4

 
282.7

Corporate and Other
(7.2
)
 
(20.3
)
 
(30.6
)
Consolidated Operating Income
$
858.2

 
$
799.9

 
$
789.1

Depreciation and Amortization
 
 
 
 
 
Gas Distribution Operations
$
252.9

 
$
232.6

 
$
217.6

Electric Operations
274.5

 
267.7

 
244.4

Corporate and Other
19.7

 
24.1

 
24.9

Consolidated Depreciation and Amortization
$
547.1

 
$
524.4

 
$
486.9

Assets
 
 
 
 
 
Gas Distribution Operations
$
11,096.4

 
$
10,094.5

 
$
9,443.7

Electric Operations
5,233.3

 
5,265.3

 
5,009.9

Corporate and Other(1)
2,362.2

 
2,132.7

 
10,136.2

Consolidated Assets
$
18,691.9

 
$
17,492.5

 
$
24,589.8

Capital Expenditures(2)
 
 
 
 
 
Gas Distribution Operations
$
1,054.4

 
$
917.0

 
$
860.3

Electric Operations
420.6

 
400.3

 
438.8

Corporate and Other
15.4

 
50.2

 
40.5

Consolidated Capital Expenditures
$
1,490.4


$
1,367.5

 
$
1,339.6


(1)Corporate and Other in 2014 includes assets of Discontinued Operations. Refer to Note 3, "Discontinued Operations," for additional information.
(2)Amounts differ from those presented on the Statements of Consolidated Cash Flows primarily due to the inclusion of capital expenditures included in current liabilities and AFUDC Equity.